Connected measuring device for an aircraft

1. A measuring device for a monitoring system intended to be installed in an aircraft, the measuring device being adapted for functioning in accordance with a first operating mode referred to as “on the ground” or a second operating mode referred to as “in flight”, the measuring device comprising: a sensor adapted for measuring at least one physical parameter of the environment of the aircraft, a radio module comprising a transmitter and being compliant with a low power wide area network standard, the radio module being adapted for sending messages comprising measurement data issuing from the sensor to a radio access point, the radio module being adapted for sending each message with a transmission power chosen from a predefined plurality of transmission powers, an electrical supply source, a managing module comprising an energy storage circuit for supplying the radio module and being configured for managing the electrical supply connected to provide cutoff between the radio module and the electrical supply module, and a control module comprising a hardware processor that is adapted for switching the operating mode of the measuring device between the first so-called “on the ground” operating mode and the second so-called “in flight” operating mode, wherein in the first so-called “on the ground” operating mode: before the sending of each message, the energy storage element is charged with a predefined energy supplied by the electrical supply source, in the second so-called “in flight” operating mode: for each message to be sent, a transmission power of the radio module is chosen, according to this transmission power, an energy necessary for the sending of the message by the radio module is determined, and before the sending of the message, the energy storage element is charged with the necessary energy determined and supplied by the electrical supply source.

2. The measuring device according to claim 1 , wherein the radio module furthermore comprises circuitry for sending a message according to a spread factor, the spread factor being chosen from a predefined plurality of spread factors, the measuring device being adapted, in the second so-called “in flight” operating mode, for: for each message to be sent, choosing a transmission power of the radio module and a spread factor, determining the energy necessary for the sending of the message by the radio module according to the transmission power chosen and the spread factor chosen.

3. The measuring device according to claim 2 , further comprising circuitry for, in the second so-called “in flight” operating mode, following the sending of a message by the radio module with a first power and according to a first spread factor, and in the absence of acknowledgement response from the radio access point: circuitry for choosing a second transmission power of the radio module and a second spread factor, for resending the message, the second transmission power and the second spread factor corresponding to an entry in a predetermined list, the list comprising the plurality of pairs formed by the plurality of transmission powers and the plurality of spread factors, each pair being associated with an energy necessary for sending a message with the transmission power of the pair and in accordance with the spread factor of the pair, the list being ordered according to the energy necessary for sending the message associated with each pair, the second transmission power and the second spread factor corresponding to the pair following the pair formed by the first transmission power and the first spread factor.

4. The measuring device according to claim 3 , wherein list does not comprise pairs formed by a transmission power and a spread factor requiring an energy for sending a message higher than a predetermined energy threshold.

5. The measuring device according to claim 3 , wherein the measuring device comprises a list associated with each size of a message to be sent.

6. The measuring device according to claim 1 , wherein the managing module for managing the electrical supply further comprises a coulomb meter.

7. A monitoring system of an aircraft, the system comprising: a plurality of measuring devices according to claim 1 , a radio access point, the radio access point being connected to an item of equipment of the aircraft.